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SSH Key based authentication setup using ansible. In this post, we are going to see how to enable the SSH key-based authentication between two remote servers using ansible by creating and exchanging the keys. We are going to use ansible built-in modules like Shell and Copy and Fetch and most importantly authorizedkey. Depending on your password length and complexity, it’s usually far less secure to use a manual password. We’ll use a private/public key pair instead of a password to authenticate and login over SSH. Generating SSH Key Pairs. To begin, we need to generate a SSH key pair.
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Ansible is a free and open source IT software that automates software provisioning, configuration management, and application deployment. One can use Ansible to create cloud hosts in EC2, patch servers, add users, configure routers/firewall and more. Ansible uses SSH which allows users and ansbile too; to log in to remote servers and perform management tasks. This page shows how to already setup SSH keys to log in into remote server using Ansible IT automation tool.
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Ansible Generate Ssh Key For User
Ansible define ssh key per host using ansible_ssh_private_key_file
You need to use ansible_ssh_private_key_file in inventory file. The syntax is pretty simple:
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ansible_ssh_private_key_file example
Let us open a file named hosts in ~/projects/ansible/hosts using a text editor such as vim command:
Sample file:
$ vim ~/projects/ansible/hosts
Sample file:
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It is possible to group it as follows:
How to dry run and test your inventory or playbooks
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You can ask Ansible not to make any changes; instead, try to predict some differences in those files:
$ ansible-playbook -i hosts my-book.yml --check
$ ansible freebsd -i hosts --list-hosts
$ ansible aws -i hosts --list-hosts
$ ansible google_cloud -i hosts --list-hosts
A list of all ansible SSH connection config options
- ansible_port=2020 : The ssh port number, if not 22
- ansible_user=vivek : The default ssh user name to use.
- ansible_ssh_private_key_file=/path/to/ssh.pem : Private key file used by ssh. Useful if using multiple keys and you don’t want to use SSH agent.
- ansible_python_interpreter=/usr/local/bin/python : The target host python path
Conclusion
You learned how to use different or multiple SSH private keys for the servers you manage using Ansible tool. For more info see “List of Behavioral Inventory Parameters” here.
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